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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bn207

Select ALL correct statements about hydrated salts named with Greek prefixes.

A $FeSO X_{4} \cdot 7 H X_{2} O$ is iron(II) sulfate heptahydrate
B $CuSO X_{4} \cdot 5 H X_{2} O$ is copper(I) sulfate pentahydrate
C $CaSO X_{4} \cdot 2 H X_{2} O$ is calcium sulfate dihydrate
D $Na X_{2} CO X_{3} \cdot 10 H X_{2} O$ is sodium carbonate heptahydrate

Answer: A, C

Sulfate is

- 2

, so Fe in

FeSO X_{4}

is +2 and Cu in

CuSO X_{4}

is +2 (not +1). Gypsum has 2 water (dihydrate). Deca is 10, not hepta (7).

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